First, do not use "name", it should be "id" in XHTML.
Second, you don't have an "href", the link needs a target "href" property (and I bet "share_url" is not supported either).
Third, <script>, while not forbidden, is almost guaranteed not to work.
Fourth, many ePub readers have no Internet connection, and some of those who have cannot connect to the Internet from the reader application.
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